1. How much impact did it cause on the yukkuri fanon?
If the stories by other posters are to be believed, this story was the origin of the poo poo dance.
2. How was it perceived here and in other sites?
Because it was drawn fairly well, it was held in high regard in so far as that concern. It was well liked by abyuse fans and hated by family friendly fans.
3. How successful was it?
I am not too sure about it but this story was likely kiriraitaa's swan song before he slowly lost interest in creating more yukkuri work.
4. And also, how do you compare it to other famous yukkuri stories?
This is held pretty highly by abuse fans in the past and the new fans seem to be of the same opinion that it is pretty good as well. There is no way of knowing though if the new ones are just saying this because they actually believe it themselves or if they wish to propagate the idea that the work is pretty good in a similar way to how some people like to spread memes or they wish to self-identify with majority of the community which is abyuse fans.
The earlier stories are probably more influential and more creative than true happiness (like that chinese guy's work who I think goes by the name of DOS) but the pacing and the good art style is probably going to be the reasons why people will probably continue to consider the story as quite decent (psychotic anons not withstanding)